Definition of "cyclas"

cyclas

noun
1. A long gown or surcoat, cut off in front, worn in the Middle Ages, sometimes embroidered or interwoven with gold.
  Quotations
  The old tunic, overtunic and cyclas were too sad and simple for the new fashions, so now strange and brilliant cotehardies, pourpoints, courtepies, paltocks, hanselines and many other wondrous garments, particoloured or diapered, with looped, embroidered or escalloped edges, flamed and glittered round the King.
  1905-06, Arthur Conan Doyle, Sir Nigel
  The effigy of Sir John de Lyons (1346) at Warkworth, in Northamptonshire, shows slight further changes; a gambeson, a sleeved haketon, and a cyclas are worn.
  1995, Henry William Carless Davis, Francis Pierrepont Barnard, Medieval England
2. A rich stuff from which such gowns were made.